2x^2-x=100

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Solution for 2x^2-x=100 equation:


Simplifying
2x2 + -1x = 100

Reorder the terms:
-1x + 2x2 = 100

Solving
-1x + 2x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + -1x + 2x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -1x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-50 + -0.5x + x2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + -0.5x + 50 + x2 = 0 + 50

Reorder the terms:
-50 + 50 + -0.5x + x2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + -0.5x + x2 = 0 + 50
-0.5x + x2 = 0 + 50

Combine like terms: 0 + 50 = 50
-0.5x + x2 = 50

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 50 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 50 + 0.0625

Combine like terms: 50 + 0.0625 = 50.0625
0.0625 + -0.5x + x2 = 50.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 50.0625

Calculate the square root of the right side: 7.075485849

Break this problem into two subproblems by setting 
(x + -0.25) equal to 7.075485849 and -7.075485849.

Subproblem 1

x + -0.25 = 7.075485849 Simplifying x + -0.25 = 7.075485849 Reorder the terms: -0.25 + x = 7.075485849 Solving -0.25 + x = 7.075485849 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 7.075485849 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 7.075485849 + 0.25 x = 7.075485849 + 0.25 Combine like terms: 7.075485849 + 0.25 = 7.325485849 x = 7.325485849 Simplifying x = 7.325485849

Subproblem 2

x + -0.25 = -7.075485849 Simplifying x + -0.25 = -7.075485849 Reorder the terms: -0.25 + x = -7.075485849 Solving -0.25 + x = -7.075485849 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -7.075485849 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -7.075485849 + 0.25 x = -7.075485849 + 0.25 Combine like terms: -7.075485849 + 0.25 = -6.825485849 x = -6.825485849 Simplifying x = -6.825485849

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.325485849, -6.825485849}

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